1lcp: Difference between revisions

Revision as of 23:47, 2 May 2008

BOVINE LENS LEUCINE AMINOPEPTIDASE COMPLEXED WITH L-LEUCINE PHOSPHONIC ACID

OverviewOverview

The three-dimensional structure of bovine lens leucine aminopeptidase (blLAP) complexed with L-Leucinephosphonic acid (LeuP) has been determined by molecular replacement using the structure of native blLAP as a starting model. Cocrystallization of the enzyme with the inhibitor yielded a new crystal form of space group P321 which has cell dimensions a = 130.4 A and c = 125.4 A. Refinement of the model against data from 7.0 to 1.65 A resolution resulted in a final structure with a crystallographic residual of 0.160 (R(free) = 0.191). The N-terminal amino group of LeuP is coordinated to Zn-489, one phosphoryl oxygen atom bridges both metal ions, and another phosphoryl oxygen atom is coordinated to Zn-488. The side chain of Arg-336 interacts with the inhibitor via three water molecules. LeuP resembles the presumed tetrahedral gem-diolate transition state after direct attack of a water or hydroxide ion nucleophile on the scissile peptide bond. On the basis of the LeuP binding mode and the previous structural and biochemical data, three plausible reaction pathways are evaluated. The two-metal ion mechanisms discussed herein share as common features a metal-bound hydroxide ion nucleophile and polarization of the carbonyl group by the zinc ions. Possible catalytic roles of Arg-336 and Lys-262 in the direct or indirect (through H2O) protonation of the leaving group, in the stabilization of a zinc-bound OH- nucleophile and in the stabilization of the negatively charged intermediate, are discussed. A site 3 metal ion approximately 12 A away from the active site 2 zinc ion probably serves a structural role.

About this StructureAbout this Structure

1LCP is a Single protein structure of sequence from Bos taurus. Full crystallographic information is available from OCA.

ReferenceReference

Transition state analogue L-leucinephosphonic acid bound to bovine lens leucine aminopeptidase: X-ray structure at 1.65 A resolution in a new crystal form., Strater N, Lipscomb WN, Biochemistry. 1995 Jul 18;34(28):9200-10. PMID:7619821 Page seeded by OCA on Fri May 2 23:47:37 2008

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OCA

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 [[Image:1lcp.gif|left|200px]]
- {{Structure
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+The line below this paragraph, containing "STRUCTURE_1lcp", creates the "Structure Box" on the page.
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-|LIGAND= <scene name='pdbligand=MRD:(4R)-2-METHYLPENTANE-2,4-DIOL'>MRD</scene>, <scene name='pdbligand=PLU:LEUCINE+PHOSPHONIC+ACID'>PLU</scene>, <scene name='pdbligand=ZN:ZINC+ION'>ZN</scene>
+or the SCENE parameter (which sets the initial scene displayed when the page is loaded),
-|ACTIVITY= <span class='plainlinks'>[http://en.wikipedia.org/wiki/Leucyl_aminopeptidase Leucyl aminopeptidase], with EC number [http://www.brenda-enzymes.info/php/result_flat.php4?ecno=3.4.11.1 3.4.11.1] </span>
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-|RESOURCES=<span class='plainlinks'>[http://oca.weizmann.ac.il/oca-docs/fgij/fg.htm?mol=1lcp FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=1lcp OCA], [http://www.ebi.ac.uk/pdbsum/1lcp PDBsum], [http://www.rcsb.org/pdb/explore.do?structureId=1lcp RCSB]</span>
-}}
 '''BOVINE LENS LEUCINE AMINOPEPTIDASE COMPLEXED WITH L-LEUCINE PHOSPHONIC ACID'''
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 [[Category: Lipscomb, W N.]]
 [[Category: Straeter, N.]]
-[[Category: hydrolase (alpha-aminoacylpeptide)]]
+''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Fri May  2 23:47:37 2008''
-''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Sun Mar 30 22:01:11 2008''